<?php echo $ajax->form(array('type' => 'post','options' => array('model'=>'Pondcase','update' => $div, 'url' => array('controller' => 'pondcases','action' => 'save')))); ?>
  <input id="PondcaseCaseid" type="hidden" value="<?php echo $caseid; ?>" name="data[Pondcase][caseid]">
  <input id="PondcasePR" type="text" name="data[Pondcase][PR]" style="width:100px;">
  <input type="submit" value="ok">
</form>